In a cruel trick of evolution, humans can stand just three feet from a ferocious animal and still be perfectly safe. This hour, Radiolab goes to the zoo.

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Jorge Luis Borges wrote, "Time is the substance from which I am made. Time is a river which carries me along, but I am the river; it is a tiger that devours me, but I am the tiger; it is a fire that consumes me, but I am the fire." And it’s still as close a definition as we have. This hour of Radiolab, we try our hand at unlocking the mysteries of time. We stretch and bend it, wrestle with its subjective nature, and wrap our minds around strategies to standardize it...stopping along the way at a 19th-century railroad station in Ohio, a track meet, and a Beethoven concert.

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Birds do it, bees do it...yet science still can't answer the basic question: why do we sleep?

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With new research demonstrating the startling power of the placebo effect, this hour of Radiolab examines the chemical consequences of belief and imagination.

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The "mind" and "self" were formerly the domain of philosophers and priests. But in this hour of Radiolab, neurologists lead the charge on profound questions like "How does the brain make me?"

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Stress may save your life if you're being chased by a tiger. But if you're stuck in traffic, it may be more likely to make you sick. This hour, a long hard look at the body's system for getting out of trouble.

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Radiolab is on a curiosity bender. We ask deep questions and use investigative journalism to get the answers. A given episode might whirl you through science, legal history, and into the home of someone halfway across the world. The show is known for innovative sound design, smashing information into music. It is hosted by Lulu Miller and Latif Nasser.

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OK. Maybe you're in your desk chair. You're in your office. You're in New York, or Detroit, or Timbuktu. You're on planet Earth. But where are you, really? This hour, Radiolab tries to find out.

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